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• FFServer streaming H.264 from Logitech C920 without re-encoding

  29 novembre 2016, par Zoltan Fedor

  I’m trying to broadcast a native .H264 webcam feed from a Logitech C920 webcam in realtime from an Odroid device (a robot) via ffserver running on a separate server (CentOS 7.1) to users’ browser without reeconding the .H264 video feed.

  Having a realtime video feed in the browser is a challenge on its own, so for now I’m just trying to get the Logitech C920 webcam on the Odroid to stream its native .H264 realtime video feed as mp4 via ffserver to users without the need to reencode the video in the process.
  Obviously I want to avoid re-encoding as that would take too much CPU time and would kill the realtime video feed. Later I might need to change the container to .flv or rtp, so it can be played from the browser in a realtime fashion. I’m using the Logitech C920 webcam, because it can do .H264 encoding on the hardware. (it has been tested by saving a file directly, it works, except the well-known ’jerkiness’ issue related to a linux kernel bug : http://sourceforge.net/p/linux-uvc/mailman/message/33164469/ , but that is a different story)

  The problem is, that however I set ffmpeg-ffserver up, as soon as ffserver is in the picture the feed gets reencoded - even from h264(native) to h264(libx264) - taking up 100% of CPU on the Odroid device and introducing a huge delay in the video feed.

  Below are my ffmpeg and ffserver settings.

  Ffmpeg from the Odroid device streaming the .H264 feed to ffserver

  $ ffmpeg -s 1920x1080 -f v4l2 -vcodec h264 -i /dev/video0 -copyinkf -vcodec copy http://xxxyyyy.com:8090/feed1.ffm
  
  ffmpeg version N-72744-g653bf3c Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu/Linaro 4.8.2-19ubuntu1)
  
    configuration: --prefix=/home/odroid/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/odroid/ffmpeg_build/include --extra-ldflags=-L/home/odroid/ffmpeg_build/lib --bindir=/home/odroid/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6581.606726, bitrate: N/A
  
      Stream #0:0: Video: h264 (Constrained Baseline), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 60 tbc
  
  [swscaler @ 0x11bf0b0] deprecated pixel format used, make sure you did set range correctly
  
  No pixel format specified, yuvj420p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x12590e0] using SAR=64/45
  
  [libx264 @ 0x12590e0] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x12590e0] profile High, level 1b
  
  Output #0, ffm, to 'http://robo-car.int.thomsonreuters.com:8090/feed1.ffm':
  
    Metadata:
  
      creation_time   : now
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: h264 (libx264), yuvj420p(pc), 160x128 [SAR 64:45 DAR 16:9], q=-1--1, 64 kb/s, 30 fps, 1000k tbn, 5 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  ^Cav_interleaved_write_frame(): Immediate exit requested00 bitrate=N/A dup=0 drop=97    
  
      Last message repeated 2140 times
  
  frame= 3723 fps=301 q=-1.0 Lsize=     396kB time=00:12:14.20 bitrate=   4.4kbits/s dup=3699 drop=103    
  
  video:321kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 23.500496%

  And the /etc/ffserver.conf on the server running ffserver :

  HTTPPort 8090                      # Port to bind the server to
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 10000             # Maximum bandwidth per client
  
                                 # set this high enough to exceed stream bitrate
  
  CustomLog -
  
  
  
  <feed>         # This is the input feed where FFmpeg will send
  
     File ./feed1.ffm            # video stream.
  
     FileMaxSize 1G              # Maximum file size for buffering video
  
  </feed>
  
  
  
  <stream>
  
    Feed feed1.ffm
  
    Format mp4
  
    NoAudio
  
  </stream>

  As you have seen above in the ffmpeg section, there is a reencoding happening on the Odroid device maxing out the CPUs :

  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))

  I have already tried setting the VideoCodec value in the ffserver config directly to libx264, tried the -re setting in ffmpeg, tried using different syntax for ffmpeg, etc. Nothing helps. Reeconding is always there and so I can’t make ffmpeg-ffserver just to broadcast the video stream as-is.

  Both ffmpeg (on the Odroid and on the server) were compiled yesterday (2015-06-09) from source, so they are the latest (and the same) version.

  Any idea ?

  EDIT :
  IN SUMMARY the issue is : I cannot find a way to get ffserver to broadcast the h264(native) feed coming from the Logitech C920 webcam without re-encoding.

• How to get your Piwik plugin translated in many languages ?

  8 septembre 2015, par Stefan Giehl — Community, Development, Plugins

  About a year ago we introduced the Piwik Marketplace to make it easy for developers to share their plugins with all Piwik users.

  As Piwik is currently available in 54 languages we would love to have as many plugins as possible available in at least a few of those languages.

  Currently most plugins on the Marketplace are only available in English and sometimes some other languages. To improve this situation, we offer plugin developers the possibility to use the power of our translators community to get their plugins translated.

  Some plugin developers are already using this service and some very popular plugins like BotTracker or CustomOptOut have already been translated in more than 10 languages !

  Getting translations for your plugin

  As long as you are developing an open source plugin hosted on Github, you may get in touch with us (translations@piwik.org) in order to get your plugin translated by the Piwik translators community.

  You will need an account on Transifex.com. If you use Transifex with a social login, please ensure to set a password in your account settings. This will be required for fetching new translations into your plugin repository.

  Importing your plugin’s strings in the translation platform

  While doing the initial setup for your plugin, we will import your english translation file (en.json) in your Github plugin repository and we will configure an auto-update for this file. Source strings on Transifex will automatically synchronise with your plugin repository. When you change any string in your en.json translation file, the updated English strings will automatically be imported in Transifex.

  How to fetch your plugins translations into your repository

  As soon as we have set up your plugin within our project Piwik on Transifex and there are new translations available, you will be able to update your plugin translations using the Piwik console. You will need a locally installed Piwik with development mode enabled, and your plugin installed. To update the translations go to the Piwik directory on your development box and execute the following command :

  ./console translations:update -u {YourTransifexUserName} -p {YourTransifexPassword} -P {YourPluginName}

  We are looking forward to seeing your Piwik plugins available in more languages ! For more information, check out our Translations plugin developer guide.

  Happy hacking,

• Download brightcove video

  17 mai 2015, par desert877

  So I have sucessfully downloaded flash videos on in the past but for some reason I am having issues with a local news report. The video I am trying to download is :

  http://www.kens5.com/story/news/2015/04/07/one-dead-after-shooting-at-north-side-auto-body-shop/25444855/

  When I check network sources I get the following output :

  http://kens-vh.akamaihd.net/z/video/25446645/25446645_,350,640,1000,2000,.mp4.csmil/3_5e4ebc852f616aa3_Seg1-Frag7?videoId=4159855028001&lineUpId=&pubId=3616287834001&playerId=3626703558001&affiliateId=&als=16.11,30,12.83,3,2176,13298,30,0,0,114,f,7.9,101.94,f,s,SCJIPJRDQHXW,3.4.0,114&hdcore=3.4.0

  I downloaded a tool recommend to me call ffmpeg and ran a command from a forum that said "Invalid data found when processing input". Unable to figure out issue there.

  Does any one know any scripts/code/tools/methods whatever that I can use to download this video ?

  Any help would be great.